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GETDATE(3)		 BSD Library Functions Manual		    GETDATE(3)

NAME
     getdate — convert user format date and time

SYNOPSIS
     #include <time.h>

     extern int getdate_err;

     struct tm *
     getdate(const char *string);

DESCRIPTION
     The getdate() function converts user-definable date and/or time specifi‐
     cations pointed to by string to a tm structure.  The tm structure is
     defined in the ⟨time.h⟩ header.

     User-supplied templates are used to parse and interpret the input string.
     The templates are text files created by the user and identified via the
     environment variable DATEMSK.  Each line in the template represents an
     acceptable date and/or time specification using conversion specifications
     similar to those used by strftime(3) and strptime(3).  Dates before 1902
     and after 2037 are illegal.  The first line in the template that matches
     the input specification is used for interpretation and conversion into
     the internal time format.

   Conversion Specifications
     The following conversion specifications are supported:

     %%	   Same as %.

     %a	   Locale's abbreviated weekday name.

     %A	   Locale's full weekday name.

     %b	   Locale's abbreviated month name.

     %B	   Locale's full month name.

     %c	   Locale's appropriate date and time representation.

     %C	   Century number (the year divided by 100 and truncated to an integer
	   as a decimal number [1,99]); single digits are preceded by 0.  If
	   used without the %y specifier, this format specifier will assume
	   the current year offset in whichever century is specified. The only
	   valid years are between 1902-2037.

     %d	   day of month [01,31]; leading zero is permitted but not required.

     %D	   Date as %m/%d/%y.

     %e	   Same as %d.

     %h	   Locale's abbreviated month name.

     %H	   Hour (24-hour clock) [0,23]; leading zero is permitted but not
	   required.

     %I	   Hour (12-hour clock) [1,12]; leading zero is permitted but not
	   required.

     %j	   Day number of the year [1,366]; leading zeros are permitted but not
	   required.

     %m	   Month number [1,12]; leading zero is permitted but not required.

     %M	   Minute [0,59]; leading zero is permitted but not required.

     %n	   Any white space.

     %p	   Locale's equivalent of either a.m. or p.m.

     %r	   Appropriate time representation in the 12-hour clock format with
	   %p.

     %R	   Time as %H:%M.

     %S	   Seconds [0,61]; leading zero is permitted but not required. The
	   range of values is [00,61] rather than [00,59] to allow for the
	   occasional leap second and even more occasional double leap second.

     %t	   Any white space.

     %T	   Time as %H:%M:%S.

     %U	   Week number of the year as a decimal number [0,53], with Sunday as
	   the first day of the week; leading zero is permitted but not
	   required.

     %w	   Weekday as a decimal number [0,6], with 0 representing Sunday.

     %W	   Week number of the year as a decimal number [0,53], with Monday as
	   the first day of the week; leading zero is permitted but not
	   required.

     %x	   Locale's appropriate date representation.

     %X	   Locale's appropriate time representation.

     %y	   Year within century. When a century is not otherwise specified,
	   values in the range 69-99 refer to years in the twentieth century
	   (1969 to 1999 inclusive); values in the range 00-68 refer to years
	   in the twenty-first century (2000 to 2068 inclusive).

     %Y	   Year, including the century (for example, 1993).

     %Z	   Time zone name or no characters if no time zone exists.

   Modified Conversion Specifications
     Some conversion specifications can be modified by the E and O modifier
     characters to indicate that an alternative format or specification should
     be used rather than the one normally used by the unmodified specifica‐
     tion.  If the alternative format or specification does not exist in the
     current locale, the behavior be as if the unmodified conversion specifi‐
     cation were used.

     %Ec   Locale's alternative appropriate date and time representation.

     %EC   Name of the base year (period) in the locale's alternative repre‐
	   sentation.

     %Ex   Locale's alternative date representation.

     %EX   Locale's alternative time representation.

     %Ey   Offset from %EC (year only) in the locale's alternative representa‐
	   tion.

     %EY   Full alternative year representation.

     %Od   Day of the month using the locale's alternative numeric symbols;
	   leading zeros are permitted but not required.

     %Oe   Same as %Od.

     %OH   Hour (24-hour clock) using the locale's alternative numeric sym‐
	   bols.

     %OI   Hour (12-hour clock) using the locale's alternative numeric sym‐
	   bols.

     %Om   Month using the locale's alternative numeric symbols.

     %OM   Minutes using the locale's alternative numeric symbols.

     %OS   Seconds using the locale's alternative numeric symbols.

     %OU   Week number of the year (Sunday as the first day of the week) using
	   the locale's alternative numeric symbols.

     %Ow   Number of the weekday (Sunday=0) using the locale's alternative
	   numeric symbols.

     %OW   Week number of the year (Monday as the first day of the week) using
	   the locale's alternative numeric symbols.

     %Oy   Year (offset from %C) in the locale's alternative representation
	   and using the locale's alternative numeric symbols.

   Internal Format Conversion
     The following rules are applied for converting the input specification
     into the internal format:

	   ·   If only the weekday is given, today is assumed if the given day
	       is equal to the current day and next week if it is less.

	   ·   If only the month is given, the current month is assumed if the
	       given month is equal to the current month and next year if it
	       is less and no year is given.  (The first day of month is
	       assumed if no day is given.)

	   ·   If only the year is given, the values of the tm_mon, tm_mday,
	       tm_yday, tm_wday, and tm_isdst members of the returned tm
	       structure are not specified.

	   ·   If the century is given, but the year within the century is not
	       given, the current year within the century is assumed.

	   ·   If no hour, minute, and second are given, the current hour,
	       minute, and second are assumed.

	   ·   If no date is given, today is assumed if the given hour is
	       greater than the current hour and tomorrow is assumed if it is
	       less.

   General Specifications
     A conversion specification that is an ordinary character is executed by
     scanning the next character from the buffer.  If the character scanned
     from the buffer differs from the one comprising the conversion specifica‐
     tion, the specification fails, and the differing and subsequent charac‐
     ters remain unscanned.

     A series of conversion specifications composed of ‘%n’, ‘%t’, white space
     characters, or any combination is executed by scanning up to the first
     character that is not white space (which remains unscanned), or until no
     more characters can be scanned.

     Any other conversion specification is executed by scanning characters
     until a character matching the next conversion specification is scanned,
     or until no more characters can be scanned.  These characters, except the
     one matching the next conversion specification, are then compared to the
     locale values associated with the conversion specifier.  If a match is
     found, values for the appropriate tm structure members are set to values
     corresponding to the locale information.  If no match is found, getdate()
     fails and no more characters are scanned.

     The month names, weekday names, era names, and alternative numeric sym‐
     bols can consist of any combination of upper and lower case letters.  The
     user can request that the input date or time specification be in a spe‐
     cific language by setting the LC_TIME category using setlocale(3).

RETURN VALUES
     If successful, getdate() returns a pointer to a tm structure; otherwise,
     it returns NULL and sets the global variable getdate_err to indicate the
     error.  Subsequent calls to getdate() alter the contents of getdate_err.

     The following is a complete list of the getdate_err settings and their
     meanings:

     1	  The DATEMSK environment variable is null or undefined.

     2	  The template file cannot be opened for reading.

     3	  Failed to get file status information.

     4	  The template file is not a regular file.

     5	  An error is encountered while reading the template file.

     6	  The malloc(3) function failed (not enough memory is available).

     7	  There is no line in the template that matches the input.

     8	  The input specification is invalid (for example, February 31).

USAGE
     The getdate() function makes explicit use of macros described on the
     ctype(3) manual page.

EXAMPLES
     Example 1: Examples of the getdate() function.

     The following example shows the possible contents of a template:

     %m
     %A %B %d %Y, %H:%M:%S
     %A
     %B
     %m/%d/%y %I %p
     %d,%m,%Y %H:%M
     at %A the %dst of %B in %Y
     run job at %I %p,%B %dnd
     %A den %d. %B %Y %H.%M Uhr

     The following are examples of valid input specifications for the above
     template:

     getdate("10/1/87 4 PM")
     getdate("Friday")
     getdate("Friday September 19 1987, 10:30:30")
     getdate("24,9,1986 10:30")
     getdate("at monday the 1st of december in 1986")
     getdate("run job at 3 PM, december 2nd")

     If the LANG environment variable is set to de (German), the following is
     valid:

     getdate("freitag den 10. oktober 1986 10.30 Uhr")

     Local time and date specification are also supported.  The following
     examples show how local date and time specification can be defined in the
     template.

     ┌───────────────────────────┬──────────────────┐
     │	      Invocation	 │ Line in Template │
     │getdate("11/27/86")	 │ %m/%d/%y	    │
     │getdate("27.11.86")	 │ %d.%m.%y	    │
     │getdate("86-11-27")	 │ %y-%m-%d	    │
     │getdate("Friday 12:00:00") │ %A %H:%M:%S	    │
     └───────────────────────────┴──────────────────┘

     The following examples illustrate the Internal Format Conversion rules.
     Assume that the current date is Mon Sep 22 12:19:47 EDT 1986 and the LANG
     environment variable is not set.

     ┌─────────────┬───────────────┬──────────────────────────────┐
     │	 Input	   │ Template Line │		Date		  │
     │Mon	   │ %a		   │ Mon Sep 22 12:19:48 EDT 1986 │
     │Sun	   │ %a		   │ Sun Sep 28 12:19:49 EDT 1986 │
     │Fri	   │ %a		   │ Fri Sep 26 12:19:49 EDT 1986 │
     │September	   │ %B		   │ Mon Sep 1 12:19:49 EDT 1986  │
     │January	   │ %B		   │ Thu Jan 1 12:19:49 EST 1987  │
     │December	   │ %B		   │ Mon Dec 1 12:19:49 EDT 1986  │
     │Sep Mon	   │ %b %a	   │ Mon Sep 1 12:19:50 EDT 1986  │
     │Jan Fri	   │ %b %a	   │ Fri Jan 2 12:19:50 EST 1987  │
     │Dec Mon	   │ %b %a	   │ Mon Dec 1 12:19:50 EST 1986  │
     │Jan Wed 1989 │ %b %a %Y	   │ Wed Jan 4 12:19:51 EST 1989  │
     │Fri 9	   │ %a %H	   │ Fri Sep 26 09:00:00 EDT 1986 │
     │Feb 10:30	   │ %b %H:%S	   │ Sun Feb 1 10:00:30 EST 1987  │
     │10:30	   │ %H:%M	   │ Tue Sep 23 10:30:00 EDT 1986 │
     │13:30	   │ %H:%M	   │ Mon Sep 22 13:30:00 EDT 1986 │
     └─────────────┴───────────────┴──────────────────────────────┘

SEE ALSO
     ctype(3), mktime(3), setlocale(3), strftime(3), strptime(3), environ(5)

BSD				January 3, 2004				   BSD
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